package com.lagou.mr.wc;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;

import java.io.IOException;

public class WordCountCombiner extends Reducer <Text, IntWritable,Text,IntWritable>{

    IntWritable total = new IntWritable();

    @Override
    protected void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {

        int sum = 0;

        for (IntWritable value : values) {
            int i = value.get();
            sum += i;
        }
        total.set(sum);
        context.write(key,total);
    }
}
